Situation: Swing or stance interference by tree or rock
Action: Play the ball as it lies or declare the ball as unplayable (rule 28) and take a one stroke penalty and either:
1. drop the ball within two club lengths from the original ball position not nearer the hole or,
2. stroke and distance or,
3. drop as far as you wish behind the point where the ball lay keeping that point directly between the hole and the spot on which the ball is dropped.